package com.ddyx.common.utils.format;

import com.alibaba.fastjson.JSON;

/**
 * 格式化输出json字符串，通常用于打印日志
 */
public class JsonFormatter {

	public static void main(String[] args) {
		String jsonStr = "{\"id\":\"1\",\"name\":null,\"obj\":{\"id\":11,\"name\":\"a11\",\"array\":[{\"id\":111,\"name\":\"a111\"},{\"id\":112,\"name\":\"a112\"}]}}";
		System.out.println(jsonStr);
		
		String formatStr = JsonFormatter.toString(jsonStr);
		System.out.println(formatStr);
	}

	public static String toString(Object obj) {
		return toString(JSON.toJSONString(obj));
	}

	/**
	 * 得到格式化json数据 退格用\t 换行用\r
	 */
	public static String toString(String jsonStr) {
		int level = 0;
		StringBuffer jsonForMatStr = new StringBuffer();
		jsonForMatStr.append('\n');
		for (int i = 0; i < jsonStr.length(); i++) {
			char c = jsonStr.charAt(i);
			if (level > 0 && '\n' == jsonForMatStr.charAt(jsonForMatStr.length() - 1)) {
				jsonForMatStr.append(getLevelStr(level));
			}
			switch (c) {
			case '{':
			case '[':
				jsonForMatStr.append(c + "\n");
				level++;
				break;
			case ',':
				jsonForMatStr.append(c + "\n");
				break;
			case '}':
			case ']':
				jsonForMatStr.append("\n");
				level--;
				jsonForMatStr.append(getLevelStr(level));
				jsonForMatStr.append(c);
				break;
			default:
				jsonForMatStr.append(c);
				break;
			}
		}

		return jsonForMatStr.toString();

	}

	private static String getLevelStr(int level) {
		StringBuffer levelStr = new StringBuffer();
		for (int levelI = 0; levelI < level; levelI++) {
			levelStr.append("\t");
		}
		return levelStr.toString();
	}

}